The impact of the intrinsic decoherence on the dynamics of a system composed of two coupled qubits inside a two-mode cavity with a nondegenerate parametric amplifier is analytically investigated. High-order nonlinearity causes strong entanglement and mixedness, which are analyzed by using entropy, negativity, and log negativity. In the absence of intrinsic decoherence, it is found that qubit-qubit coupling improves the generation of population inversion, entanglement, and mixedness. The coupling acts as external decoherence in the presence of the intrinsic decoherence, and the quantum effects evolve monotonically to non-zero stationary values. The qubit-qubit entanglement is crucially dependent on the nonlinearity and the intrinsic decoherence. The stability of this entanglement is granted for small intrinsic decoherence.

分析研究了本征退相干对由两个耦合量子位组成的系统动力学的影响，该系统由具有非简并参量放大器的双模腔内的两个耦合量子位组成。高阶非线性会导致强烈的纠缠和混合性，通过熵、负性和对数负性进行分析。在没有内在退相干的情况下，发现量子位-量子位耦合改善了种群反转、纠缠和混合的产生。在存在固有退相干的情况下，耦合充当外部退相干，并且量子效应单调地演变为非零固定值。量子位-量子位纠缠在很大程度上取决于非线性和内在退相干。这种纠缠的稳定性是由于小的内在退相干。